Trinity Hill, a mid-sized Hawkes Bay wine producer, said US winery owner Charles Banks planned to take a controlling 67 per cent stake in the company, subject to regulatory approvals.
The purchase price was not disclosed.
Charles Banks, through his company Terroir Selections, already has a 24.9 per cent stake in Trinity Hill - another medium-sized winery producing around 60,000 cases of wine a year.
Trinity Hill chief executive Michael Henley said Trinity Hill founders Robyn Wilson and John Hancock intended to remain as shareholders in the company, which is a prominent producer in Hawkes Bay.
The company is Charles Banks's first wine investment in New Zealand. His other wine holdings are in the United States and South Africa.